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anurag tangri commented on MAPREDUCE-2001: ------------------------------------------ Hi, Any update on this ? We are facing the same issue as David and I agree it is a common enough request. -Anurag > Enhancement to SequenceFileOutputFormat to allow user to set MetaData > --------------------------------------------------------------------- > > Key: MAPREDUCE-2001 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-2001 > Project: Hadoop Map/Reduce > Issue Type: Improvement > Affects Versions: 0.20.2 > Reporter: David Rosenstrauch > Priority: Minor > > The org.apache.hadoop.mapreduce.lib.output.SequenceFileOutputFormat class > currently does not provide a way for the user to pass in a MetaData object to > be written to the SequenceFile. > Currently he only way for a developer to implement this functionality appears > to be to create a subclass which overrides the SequenceFileOutputFormat's > getRecordWriter() method, which is a bit of a kludge. > This seems to be a common enough request to warrant a fix of some sort. > (It's already been brought up twice in the past year: > http://www.mail-archive.com/common-user@hadoop.apache.org/msg02198.html and > http://www.mail-archive.com/mapreduce-user@hadoop.apache.org/msg00904.html) > A couple of possible solutions: > 1) provide a static method SequenceFileOutputFormat.setMetaData(Job, MetaData) > 2) Provide a (non-static) setMetaData() method on the > SequenceFileOutputFormat class. The user would create a subclass of > SequenceFileOutputFormat which, say, implements Configurable. Then in the > setConf() method, the user could create the MetaData object (using data from > the Configuration), and then call setMetaData. The SequenceFileOutputFormat > would then use this MetaData object when creating the SequenceFile. (Note > that the user would have to create a subclass of SequenceFileOutputFormat to > make this solution work.) -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira